Homemade Yuzu Kosho: Fermented Citrus-Chili Paste
A vibrant, fermented Japanese condiment made from green yuzu zest, green chilis, and salt—spicy, salty, and citrusy in one bite.
- Prep30 min
- Total30 min
- DifficultyMedium
- Servings10
This homemade yuzu kosho brings a bright, punchy flavor to soups, grilled meats, dressings, or rice. A small dab transforms simple dishes with its unique blend of heat, salt, and citrus.
Making it at home is surprisingly simple: just zest, chop, salt, and let time work its magic. The result is far more vibrant than anything store-bought, and it keeps for months in the fridge or freezer.
Ingredients
Servings
Converted amounts are rounded.
Method
- Gather all ingredients. Buy a little extra of each, as fruit sizes vary. Sterilize a glass jar by boiling or steaming it for 10 minutes, then air-dry upside down on a clean towel.
- Zest the yuzu with a microplane, avoiding the bitter white pith. Weigh the zest on a digital scale; this is your base weight (e.g., 25 g).
- Optional method: Peel the yuzu with a knife or vegetable peeler, then trim off the white pith.
- Wear food-safe gloves. Trim the stems, halve the chilis lengthwise, and scrape out the seeds. Gloves prevent painful accidental burns—capsaicin lingers on skin and can cause severe burns if you touch your eyes.
- Use a small paring knife to slice away any remaining white pith. Weigh the prepped chilis to match your yuzu zest weight exactly (e.g., 25 g).
- Transfer the chilis and zest to a food processor.
- Pulse, scraping down the sides as needed, until finely chopped. For a smoother, traditional texture, finish by hand in a mortar and pestle—it releases more citrus oils for an incredibly aromatic paste.
- Place a bowl or mortar on a digital scale. Transfer the paste and record the total weight. Calculate 15%–20% of the paste weight in salt (e.g., 7.5–10 g salt for 50 g paste).
- Weigh the calculated salt and mix it in thoroughly (grinding with a mortar and pestle) until fully dissolved and hydrated. Only add a small drizzle of fresh yuzu juice if the paste looks dry—the salt usually draws out plenty of moisture naturally.
- Transfer the paste into your sterilized glass jar, pressing out air pockets. Lay a small piece of parchment paper directly on top of the paste surface. Close the lid tightly to create an anaerobic environment.
- Rest at room temperature for 24 hours (if your kitchen is cool), then transfer to the refrigerator. Age in the fridge at least 7 days (2 weeks recommended) to mellow raw heat and develop a rounded flavor.
- Store in the fridge for about 6 months. It freezes exceptionally well without turning solid—scoop straight from frozen whenever needed.
💡 Tips
- Use a microplane for the zest to get fine, aromatic strips without the bitter pith.
- Wear gloves when handling chilis to avoid capsaicin burns.
- For a smoother texture, finish grinding in a mortar and pestle.
Inspired by a recipe from Just One Cookbook